cos^2x-sin^2x+sin^2x=0.5
cosx=корень(2)/2 cosx=-корень(2)/2
x1=п/4+2пn x2=-п/4+2пn
n=1, x1=9п/4 x2=7п/4
а)x=п/4+2пn; -п/4+2пn
б)9п/4;7п/4
cos^2x-sin^2x+sin^2x=0.5
cosx=корень(2)/2 cosx=-корень(2)/2
x1=п/4+2пn x2=-п/4+2пn
n=1, x1=9п/4 x2=7п/4
а)x=п/4+2пn; -п/4+2пn
б)9п/4;7п/4